Gas-producing furnace.



Pateted Apr. 4, 1911.

s SHEETS-sum1. v

GAS PRODUGING FURNAOE. APPLIOATION FILED Dm 19, 1908.

E. VON MALTITZ 8 H. B. BARNHART.

WITNESSES E. VON MALTITZ & H. B. BARNHART. GAS PRODUOING FURNACE.

APPLIoATroN FILED 13110.19, 1908.

988,580. Patented Apr. 4, 1911.

*han Ohm UNITED sTATEs PATENT o'EEicE.

EDMUND VON MALTITZ AND HENRY B. BARNHART, 0F CHICAGO, ILLINOIS.

GAS-PRODUCING FURNACE.

Specication of Letters Patent.

Patented lApr. 4, 1911.

Application mea December iafiaos. serial No. 468,300'.

To all- 'whom 'it may concern:

Be it known that we, EDMUND voN MALT- i'rz and HENRY B. BARNHART both of Cl1icago, Cook county, Illinois, have invented a new and useful Gras-Producing Furnace, of which the followin is a full, clear, and exact description, re erence being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a vertical section through one form of furnace illustrating our invention;

Fig. 2 is a sectionalV plan view on the line1 `II-II of Fig. 1, withy parts broken away;

Fig. 3 is an inverted plan view of theagitating arms; and Fig. 4is a sect-ional Viewl on the line IV-IV of Fig. 3.

' Our invention relates to furnaces for producing a uniform as from solid fuel, with the least amount o manual labor, and lisdesigned to provide means of novel and efl'ective character for leveling the fuel abo've the grate and for agitating it to keep it free from ash and to prevent the formation of clinkers; also to provide a furnace which will partially gasify the fuel above a ate, while the remaining gas is liberated elow the said grate; also to provide a furnace having a novel arrangement and construction of grates, and air supply leading thereto whereby we are enabled to su ply air to the fuel from the outside tliereo as well as from a `central point within the bed of fuel.

The precise nature of our invention will be best understood by reference to the accompanying drawings, which will now be' described, it being premised, however, that changes can be made in the construction and arrangement by those skilled in the artwitlh out departino` from our invention as shown and describe In the drawings, the numeral 2 designates the chamber of the furnace, which is pref-A erably an upright cylindrical shell contracted inwardly at the top, and is provided with a fuel charginginlet 3 and a gas outlet' 4. The furnace 2 is supported on columns 5, which are in 4turn supported on any suitable foundations. The lower portion of the furnace is provided with the 'hollow frustoconical base 6 to which is secured or formed integrally therewith a downwardly projecting shell 7, provided with an inwardly an downwardly projecting ange 8 at its upper end and at its lower end with a flanged ring 9 having projecting ribs between it and the shell 7. Restin on the flange of the ring 9 and secured to t e flange 8 of the shell 7 are the grate bars 10, which are arranged to form a hollow, downwardly convergingcone.

11 is 'an air chamber, open at its lower end and wh/ose walls are -composed of the shell 7, its flange 8, ring 9 and grate bars 10. Mounted on suitably journaled anti-friction rollers 12 is a water pan 13, having a wormwheel'14 which is engaged by a worm 15 on a shaft 16 mounted in Vbearings 17, and which is driven from any suitable source of power to rotate the an. Projecting upwardly from this pan istlie sleeve or casing 18, whose upper portion is rovided with the conical grate 19 and the ange 20, and secured to the flange 2O is a hollow hub 21 of ed the branch pipes 26 and 27 having the' respective gate valves 28 and 29. -The branch pipe26 leads into the air chamber 11 and the pipe 27 leads into the tube 24.

30 is a water supply ipe leading from any source to the center of) the tube 24, and is provided with a joint 31 to which is connected an upwardly projecting pipe 32; this joint 31 permitting a rotation of the pipe 32 with relation to pipe 30. This pipe 32 projects upwardly and is connected to a coil of cooling pipes 33 encircling the central 4step grate 23, and 34, 34 are branch pipes connected to the pipe 32 and-a series of cooling channels 35, 35 in the agitator arms 22. The hollow frusto-conical portion 6 of the furnace 3. is connected tothe water supply pipe 30 by means of a pipe 36.

Secured to the lower poition of the shell 7 is the scraper 37, which projects downward into the water/pan 13, whichpan is normally filled with water to seal themouth of the air chamber 11, and the lower end of t-he furnace. The agitator arms 22 are curved and angular in cross-Section, as shown 1n Figs. 3

andl 4. The front edge of these agitators g formation of holesor channels inthe fuel are sharp and curved in such a manner that the rotation thereof through the medium of the water-pan driving mechanism, will cut through lthe fuel and tend -to draw it from the center of the furnace to the edge thereof. g

The coalis'dumped into the furnace 2, through the fuel charging inlet 3 by any well known means, and suilicient -fuel is kept g therein Ato keep the level thereof well above t the level of the arms 22 of the agitator. The

rotation of these arms cutstlirough the fuel levels and keeps the upperi portion in mtion. The rotation of the sleeve 18, hub 21 and water-pan 13,1eeps the lower portion of theffuel in'motion breaking up all clinkers and discharging the ashes into the pan 13 from which they, are scraper-37,

By our improved apparatus .We are enabled to gasify a portion of the carbon conremoved by the i tained in the fuel located above the incandesvent bed b vi'hc introduction'of air through the grate lf). This partial gasification of the fuel by means of the upper central grate tends to keep down the temperature in the incandescent bed to a point belowthe temperature at which the formation of clinkers begins; while the rotation of the agitators assists in the prevention of the formation of clinkers and valso assists in an equal gasification ofthe fuel in this portion of the furnace. The carbon remaining in the -fuel bei low the grate 19 is supplied with a large "quantity of atmospheric oxygen, and since the temperature in this part of the producer, on account of the large percentage of ash present in comparison with the car on, cannot reach such a temperature where clinkers are made and carbon monoxid is formed, this carbon is burned to carbon dioxid. This dioxid rises gently throughthe bed of incandescent coke where it is reduced to monoxid,

. and where on account of this endothermic react-ion the temperature is lowered. The air which-enters through the grates 10 and 19, and which has not lost all its atmospheric oxygen, will` meet the incandescent coke bed in a` pre-heated state, which is expedient for a speedy reaction.

The advantages of our invention result from the partial gasification ofthe fuel' above the main grate in the manner described, thereby preventing `excessive heat above the main grate also from the breaking up and leveling of the upper surface of the fuel and the freeing of ashestherefrom by the operation of the agitator, whereby even and continuous gasification is obtained,

and all yclinker formation is prevented `or broken up. The water-pan formsa perfect seal for the bottom of the furnace, whilev its rotation and the rotation of the sleeve` and central grate provides for an even feed of fuel and ash discharge, thereby avoiding the bed .which would permit the undeeomposed atmospheric oxygen passing through the furnace.

By means of the apparatus shown and described we are enabled to generate a gas without the aid of steam, which 4is dry, high in inonoxid and low in dioxid, and which is comparatively free from dust, due to the slow `even current of gas leaving the producer.

1. A gas producer consisting of a furnace having a main grate to receive the fuel, a rotating water-pan to seal the bottom of the furnace, a centrally located tube projecting and to receive the ashes thereupon, a centrally located tube projecting from the pan into the furnace, a grate at the upper end of the tube and above the main grate, a second grate formed in the Walls of said tube, agitat-ing arms secured to the tube between the grates thereon, a hollow shaft within the tube and around which the said tube and the main grate,- a rotatable water-pan L mounted onanti-friction rollers to seal the air chamber and bottom of the furnace and to receive the ashes thereupon, a centrallyv located tube projecting from the pan into the furnace, a grate at the upper end of the tube and above the main grate, a second grate formed in the walls of said tube, agitat-ing arms secured'to the tube between the grates thereon, means'to cool the tube and agitatingarms, a hollow shaft within the tube and around which the said tube and water-pan rotate, and means to suppl)7 air .to the air chamber and the hollow shaft;

substantially as' described.

4. A gas producer consisting of a furnace with a main grate, a water-cooled ring above thexmain grate, an air-chamber surrounding the main grate, av rotatable water-pan to seal the air chamber and'bottom of the furnace and arranged to receive ashes thereupon, a

centrally located tube projecting from the paii intothe furnace, a grate at the upper iso,

- end of the tube and above the main grate, al. In testimony whereof, we have hereunto f vf second' grateformed in the walls of said set our hands.

tube, a hollow shaft Within the tube around E. VON MALTITZ. which the said tube and Water-pan rotates, H. B. BARNHART. 5 and means to supply air to the air chamber Witnesses:

and the hollow shaft; substantially as de.- W. C. DAvms, scribed.y (LW. ROBERTSON.

Copies of this patent may be obtained for ve cents each, by addressing `the Commissioner of Patents,

Washington, D. C. 

